Supply and relief valve



April 7, 1931.* v Q F, HEYVJOD 1,799,587 l SUPPLY AND RELIEF VALVE Filed Nov. 30, 1927 n :v l l l aucun, Y

lao

Patented Apr'. 7, 1931:

UNITI-:o STATES Pari-:Nr oFFlcE CHARLES I'. HEYWOD, 0F DETROIT, MICHIGAN, ABSIG-NOB T0 SKY SPECIALTIES COIR-4 POEATION,4 F DETROIT, .MICBIGALL A CORPORATION 0F MICHIGAN vsurrrfsr AND Ranma vanva A pressure storage tank which is continuously charged by a pump may be provided' with a relief valve which is operated by excessive pressure in the tank lto cause the pump to discharge throu h a bypass into the atmosphere. Although t ese devices function properly when the maximum desired pressure in the tank is' exceeded, theyI do not respond promgtly to-close the bypass when the pressure as dropped below the desired'maximu'm. In other words, they usually require that the tank pressure'fall considerably below the desired maximum before they are actually reversed and closed.

overcome this diliculty and to provide auxiliary means for closing the bypass.. It will be obvious that the valve -operating means is acted upon at oneside by a conduit leading from the pressure vessel. At the other side of the valve mechanism is provided a spring which must be overcome by the pressure in\ the vessel in order that the valve shall open. The auxiliaryv means mentioned above is appliedto this side of the valve mechanism. It consists merely of a fluid connection extending to/this side of the valve mechanism from the normal or service outlet of the tank. g

When the latter outlet is 'opened for operatconnection to` one side of the valve mechanisln will balance the tank pressure at the nism in on position will accomplish its function without pressure resistance.

` The conduit .leading fromthe tank .to the valve mechanism for opening the'bypass at excessive tank pressure is provi-ded` with la pressure balanced check valve which is normall open. This valveis arranged to close in t e direction of the valve mechanism. Thus,.whenthe. reliefvalve mechanism is 45, parts, the relief of pressurethus produced in`the..valve device will upset the balance o f the check, valve and cause the latterV to close under the influence of the tank'pressure. In

`this manner I avoid the loss of pressure 5 .while valve is: being Acleaned The object of the present invention i's'to` ing purposes, the uid'passing through the describedas bein opened'at any point for 'repair or replacement` o or repaired, and this constitutes another featureof the invention.

, The invention is fully disclosed by way of example in the following descriptionand in the accompanying drawing, in which- F gure 1 is a longitudinal section of the dev1ce 'e Fig. 2 is a section on the line 2-2 of Fig- -to designate corresponding parts throughout.

The numeral 1 designates the wall of a stor' age tank fitted with an adapter 2 into which is threaded'a valve block 3. From the base of this'block a tube 4 extends intothe tank 'and is formed at its upper end, near the adapter, with a peripheral series of outletports 5.

A normal orservice outlet passage 6 leads fromthe tube 4k through the block and is formedwitha lthreaded end 7 at a wall of the \block for the attachment of a suplply line thereto. This line .is connected to t e point or points at which the pressure fluid 1s de'- sired, for example, a distributor adapted vfor successive communication with the cylinders of an engine for turnin the engine over as disclosed in my copen` g application, Serial No. 211,365, led August 8, 1927.

Immediately over the ports the block is formed with a valve seat 8 which may be tube 4 andthe out et'6. Into the lower end positioned g between the r internal lia ge 1U on which is seateda sprlnv' 11. vThe s l g in-turn supports a valve hea 12 having a composition insert 13 adapted to" engage and close the seat 8. The valve head is square or otherwise polygonal, as shown in Figure 4 and has its vertices in engagement with the inner walljof the ltube so that'the fluid will flow between the sides and the inner i' wall Aof the tube tothe valve seat. The valvehead 12 isl actuated by a` rod 12a slidably mounted in the block 3, axiallyof the routlet '6, and having its upper-:end engaged by an,

o rating lever 12b which is pivoted and mova le in a slot 120 formed in the block.

The pressure fluid is supplied to the tank from a pump or other source (not shown) adapted for connection to a passage 14 formed in the block. The passage enters a valve chamber 15, the urpose of which will presently be described, and is extended from this chamber in the form of a duct 16 at right angles to the passage 14 and leading into a valve chamber 17 drilled from a wall of the block as shown more clearly in Figure 2. Between the duct 16 and chamber 17 is formed a valve seat 18 provided with a valve head 19. The head is backed by a 4spring 20 disposed in the chamber and abutting a plug 21 screwed into the open end of the chamber for closing the same. The path :from the passage 14 to the tank is completed by another duct 22 leading from the valve chamber 17 into a conduit 23, having one end entering the tank. This end is enlarged as at 24 to provide a valve seat 25. In the enlargement is dis osed a ball valve 26 resting on a pin `27 an normally held spaced from its seat by means of a spring 28 acting thereon in the direction of the tank. Itwill lnow be apparent that the valve in the chamber 17 is a check valve which prevents the tank from discharging through the passage 14 when the tank pressure exceeds the charging pressure.

The block is'further formed with a cham- -ber 29 "containing valve mechanism for cona sealing disk 36. On the disk is supported a spring 37 capable of being overcome by trolling a relief bypass. This bypass consists of the passage 14, the valve chamber 15 leadin into the base of the chamber 29, and a re ief passage 30 extending from the base of the chamber 29. Between the valve chamber 15 and the chamber 29 is formed a valve seat 31 engageable by a ball valve 32. This valve is normally held against its seat by a spring 33 resting on a lug 34 closing the chamber 15 at the wall o the block 3. The bypass is normally obstructed by the ball valve 32 but is opened for the purpose of permitting the pump to discharge into the atmosphere by the operation of mechanism within the chain ber 29 when the tank pressure exceeds the determined maximum.

In the lower part of the chamber 29 is formed an internal shoulder 35 directly above the connection between the chamber and the passa-ge 30, and on this shoulder is supported excessive pressure in the tank. On-the spring is mounted a plunger 38 slidably mounted in .the chamber andv provided with a stem 39 passing axiall through the spring and through the dis 36 to a point close to the ball Ivalve 32. In the upper part o the chamber lis formed another shoulder 40 on which is laid a diaphragm 41 engaging the top of the plun er 38. The diaphragm is bound at its edge y a nut 42 screwed down towards the shoulder 40. The nut has a central aperture 43 to permit flow of pressure fluid to the diaphragm and is also formed with a concave lower surface 44 providing a pressure chamber immediately above the diaphragm. A plug 45 is screwed into the outer end of the chamber 29 and is spaced as at 46 from the top of the nut 42. The above mentioned condesired maximum -pressure is exceeded, the

spring is overcome, and the plunger and stem' move downwardly to unseat the valve 32.

The fluid which is charged into the passage 14 is thereby bypassed'through the passage 30 without reaching the tank.

In order to maintain the valve 32 definitely in open or closed position, the plunger is provided with a pair of peripheral grooves 47 and 48 cooperating with spring pressed balls 49 mounted in the block 3 and adapted to enter either one groove or the other.

The means for facilitating reclosing of the ball valve 32-When the tank pressure is no longer excessive consists of a connection or duct Oextending from the normal outlet 6 to the chamber 29. Assuming that the plunger fails to respond to the pressure drop in the tank,'the full tank pressure Will be applied to the lower face of the plunger when the delivery valve 12 is next opened for service purposes. In this manner the constant pressure on the top of the diaphragm will be balanced by the pressure admitted through the duct 50, and the spring 37 will now be free to return` the plunger to valve-closing position.

The sealing disk 36 prevents the pressure delivered'through the duct 50 from escaping through the passage 30, whereby the total pressure fromthis source is actively applied to the. bottom of the plunger. yThe disk also guides ythe pin 39 and preventsoil from being thrown from the pump against the spring, plunger and diaphragm.

It will be apparent 'that the relief valve and delivery valve may constitute 'separate members, rather than being built in a single block as shown, in which case the normal outlet 6 may be joined to the chamber 29 by a pipe or the like. It is' also to be observed that the ball valve 26 is normally balanced by pressure on both vsides thereof, and as .a

Aconsequence of this arrangement, the valve vessel to the diaphra for moving the plunger to the valve-openin position.; in combination with a normal out et adapted for connection to said vessel, and a Huid connec-l 'tion extending .from said outlet to said chamber and positioned to return the plunger, by

the passage of uid through the connection, to normal or valve-closing position.

n testimon whereof I aliix my signature;

y HARLES F. HEYWOOD.

said bypass, a fluid conduit leading to said mechanism and adapted for communication with a pressure vessel, a valve in said co'nduit adapted to close inthe direction of said valve mechanism, and means acting on said valve in the opposite direction to normally hold it open.

2. In combination with a safety valve adapted for connection to a pressure vessel and having a relief bypass and valve mechanism controlling the same; a normal outlet adapted for connection to the pressure'vessel, va fluid connection extending from the outlet to said valve mechanism and positioned to return the valve mechanism, -by

- the passage of fluid through the connection,

toy normal or closed position, and a discharge valvel controlling said outlet and iuid connection extending therefrom.

3. In' combination with a safety valve adapted for connection to a pressure vessel and having a relief bypass and valve mechsol anism' controlling the same a normal out-v let adapted for connection to the pressure vessel, a fluid connection extending from the outlet to said valve mechanism and posi-` tioned to return the valve mechanism, by the passage of fluid through the connection, to normal or closed position, a seal between said bypass and the outletend of said connection, and a discharge valve controlling saidoutlet and fluid connection extending therefrom.v

4. A safety valve adapted for connection to a pressure vessel and having a relief bypass and a valve controlling and normally closing the same, a plunger adapted to open sa1d valve, and a connection. from the vessel latter to 'the valve-opening position; combination with a normal outlet adapted for connection to said vessel, and a iuid connection extending from said outlet and presented to the other side ofy said plunger.l

5. A safety valve adapted for connection vto a pressure vessel and having a'relief bypass, a valve controlling and normally closmg the same, a chamber, a seal positioned lbetween said bypass and chamber, a plungerv mounted in said chamber, a spring positioned to one side 'of the plunger for moving the between said seal and plunger, a pin extending from said plunger through said seal and adapted to engage said valve, a diaphragm xed in the chamber and engaging one side of said plunger, and a connection fromthe 

